Ladder 68,
The Pierce dealer should be able to reference the DCFD specs for the recent Pierce Wagons. That seems to make life easier on them since they can cut and paste from one spec to another. Also there are several SMIB wagons that have DCFD standpipe rack trays such as Hollywood Maryland. Atlantic Emergency Solutions (Pierce Dealer in Northern Virginia) has a spec for Shepherdstown, W.V. that has a DCFD standpipe rack tray.
Attached photos are from E-27's 2006/2008 Seagrave.
Hope this helps!